<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
<div id="app">
    <h3>当前计数：{{counter}}</h3>
    <!-- <button v-on:click="counter++">+</button>
    <button v-on:click="counter--">-</button> -->
    <!-- <button v-on:click="add">+</button>
    <button v-on:click="sub">-</button> -->
    <button @click="add">+</button>
    <button @click="sub">-</button>
</div>

<script src="../js/vue.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data:{
            counter: 0
        },
        methods: {
            add: function(){
                console.log('add被执行');
                this.counter++;
            },
            sub: function(){
                console.log('sub被执行');
                this.counter--;
            }
        },
        created: function(){
            console.log('created');
        },
        mounted: function(){
            console.log('mounted');
        }
    })
</script>
</body>
</html>